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unmarked is an R package available for download from CRAN that fits hierarchical models of animal abundance and occurrence to data collected using survey methods such as point counts, site occupancy sampling, distance sampling, removal sampling, and double observer sampling. Documentation comes with the package. The following R code will install the package and open some of the help files.

install.packages("unmarked")# Download the package. You might need to choose a CRAN mirrorlibrary(unmarked)# load the package?unmarked # general help page?occu # help page for the single-season site occupancy modelvignette("unmarked") # document describing the package with example R code vignette("distsamp") # distance sampling analysis in unmarkedvignette("colext") # dynamic occupancy models in unmarked